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CVE-2026-21222

MediumCVSS 5.5/10Last modified Jun 17, 2026

Description

Insertion of sensitive information into log file in Windows Kernel allows an authorized attacker to disclose information locally.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 10 Version 1607	>= 10.0.14393.0, < 10.0.14393.8868
Microsoft	Windows 10 Version 1809	>= 10.0.17763.0, < 10.0.17763.8389
Microsoft	Windows 10 Version 21H2	>= 10.0.19044.0, < 10.0.19044.6937
Microsoft	Windows 10 Version 22H2	>= 10.0.19045.0, < 10.0.19045.6937
Microsoft	Windows 11 version 22H3	>= 10.0.22631.0, < 10.0.22631.6649
Microsoft	Windows 11 Version 23H2	>= 10.0.22631.0, < 10.0.22631.6649
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.7840
Microsoft	Windows Server 2012 R2	>= 6.3.9600.0, < 6.3.9600.23022
Microsoft	Windows Server 2012 R2 (Server Core installation)	>= 6.3.9600.0, < 6.3.9600.23022
Microsoft	Windows Server 2016	>= 10.0.14393.0, < 10.0.14393.8868
Microsoft	Windows Server 2016 (Server Core installation)	>= 10.0.14393.0, < 10.0.14393.8868
Microsoft	Windows Server 2019	>= 10.0.17763.0, < 10.0.17763.8389
Microsoft	Windows Server 2019 (Server Core installation)	>= 10.0.17763.0, < 10.0.17763.8389
Microsoft	Windows Server 2022	>= 10.0.20348.0, < 10.0.20348.4773
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	>= 10.0.25398.0, < 10.0.25398.2149
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.32370
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.32370

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21222Vendor Advisory

Timeline

Published: Feb 10, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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CVE-2026-21222: Medium severity, CVSS 5.5 | Vulnix